Little Long Lake
Hennepin County, Minnesota175 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Little Long Lake. Here is what has been measured.
- Mesotrophic
- Eurasian watermilfoil
- 45 ft max depth
- Public access
Little Long Lake in Hennepin County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 18.7 ft visibility. Phosphorus: 27.5 µg/L. Chlorophyll-a (algae): 4.8 µg/L. Maximum depth: 45 ft. Surface area: 175.45 acres.
Minnesota DNR's Standard Survey on July 22, 2024 caught 0.33 walleye per gill net at Little Long Lake. DNR survey details →
Little Long Lake is a 175-acre mesotrophic lake in Hennepin County, Minnesota with a maximum depth of 45 feet. Overall water quality is improving over recent sampling years. The lake supports 13 documented fish species including black bullhead, black crappie, and bluegill. Public access is available with 1 public boat landing. Compared to the 80 other monitored lakes in Hennepin County, Little Long Lake ranks #17 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-10-07. Methodology: how these readings are compared.
Little Long Lake covers about 180 acres in Hennepin County. It has one public boat landing. The median ice-out date is April 5, which is when the open-water season begins. For a place on the water, look through cabin and lake-house rentals near Little Long Lake on Vrbo. For a hotel or motel room, Booking.com and Expedia both search around the lake.
What Little Long Lake is good for
From access and monitoring records, not editorial picks.
- Clear water18.7 ft of visibility
- Boat launch1 documented ramp
- Fishing13 species recorded
- Ice seasonIce-out around Apr 5
- Deep water45 ft surveyed max depth
Swimming conditions
Readings onlyModerate algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Little Long Lake is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Little Long Lake
These are the measurements Minnesota PCA publishes for Little Long Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 18.7 ft down. Phosphorus 27.5 µg/L. Chlorophyll-a 4.8 µg/L. TSI 44.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 18.7ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 27.5µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | 4.8µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 44 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Little Long Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Little Long Lake typically sits around 50°F at the surface in October. Summer average is about 51°F. Usually warmest in Aug (about 52°F) and coldest in Apr (about 43°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (43°F) to its warmest (52°F).
Typical surface water temperature by month, from 2,581 field readings (2010–2024) via the EPA Water Quality Portal. See the full Little Long Lake water temperature breakdown →
Minnesota DNR's Standard Survey on July 22, 2024 caught 0.33 walleye per gill net at Little Long Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Little Long Lake’s water-quality measurements separately, and the water-quality trend over 6 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
DNR Fisheries Survey Summary
9 surveys on file from MN DNR Fisheries. Most recent: 2024-07-22 (Standard Survey).
9 surveys on file · most recent 2024-07-22 (Standard Survey)
| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| Bluegill | 30.54 | 2–8 in 2024-07-22 | 0.21 lb |
| Black Crappie | 11.36 | 6–10 in 2024-07-22 | 0.23 lb |
| Black Bullhead | 4.99 | 9–12 in 2024-07-22 | 0.64 lb |
| Largemouth Bass | 4.73 | 9–16 in 2024-07-22 | 1.29 lb |
| Yellow Bullhead | 3.48 | 6–13 in 2024-07-22 | 0.67 lb |
| Northern Pike | 2.17 | 16–34 in 2024-07-22 | 3.32 lb |
CPUE = catch per unit effort, fish caught per net per set in a standardised survey. It measures abundance, not size, and is not a weekly bite report.
Length Distributions
Number of fish caught at each inch class in the most recent survey that recorded lengths. Red dashed line marks an approximate trophy threshold for that species.
Bluegill
Black Crappie
Black Bullhead
Largemouth Bass
From the 2024-07-22 survey
Dutch Lake is a 172-acre lake with a maximum depth of 45 feet. Dutch is located north of the City of Mound, in southwest Hennepin County. Public access is provided by a city-owned boat ramp located on the southeast side of the lake. Dutch is primarily managed for Northern Pike, Bluegill, and Black Crappie, and also…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Little Long Lake. 2 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — DutchFisheries Lake Survey · MN DNR LakeFinder
- —Public Water Access Sites — DutchPublic Water Access Sites · MN DNR LakeFinder
Lake Details
Max depth
45 ft
Surface area
175 acres
Shoreline
3.2 mi
Littoral zone
47%
Share shallower than 15 ft
Public access
Yes
Listed by Minnesota PCA
Lake Size & Watershed
Watershed (drainage) area
0 sq mi
HydroLAKES / HydroSHEDS
Elevation
948 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Little Long LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Little Long Lake
Compare lakeside cabins, hotels, and vacation rentals near Little Long Lake in Hennepin County, Minnesota — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Little Long Lake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Minnesota’s top lakes →
Follow Little Long Lake’s readings
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Fish Species
Click a species to see every lake where it is documented.
Fishing Little Long Lake
- → Little Long Lake fishing: DNR survey catch rates, species & stocking
- → Little Long Lake fishing forecast & best times (species outlook + 14-day solunar calendar)
- → Little Long Lake fishing regulations (limits, seasons, special rules)
- → Is it safe to eat fish from Little Long Lake? (mercury & PFAS guide)
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Water Quality Trend: Improving
Based on 6 years of monitoring (2020–2025).
Water clarity
Improving6 years
Phosphorus
Improving-1.52 µg/L/yr4 years
Chlorophyll-a
Improving-1.98 µg/L/yr4 years
Ice season
Typical ice-out
Apr 5
Earliest Mar 19, 2012 · Latest Apr 10, 2011
Most recent ice-out
Mar 19
2012
4 observations · Minnesota PCA ice records
Nearby Lakes in Hennepin County
Frequently asked questions about Little Long Lake
Where is Little Long Lake?
- Little Long Lake is a lake in Hennepin County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Little Long Lake?
- Little Long Lake in Hennepin County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 18.7 ft visibility. Phosphorus: 27.5 µg/L. Chlorophyll-a (algae): 4.8 µg/L. Maximum depth: 45 ft. Surface area: 175.45 acres.
Is Little Long Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Little Long Lake?
- Little Long Lake typically sits around 50°F at the surface in October, from 2,581 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
How deep is Little Long Lake?
- Little Long Lake has a maximum depth of 45 feet. The lake covers 175.45 acres.
What fish are in Little Long Lake?
- Fish species found in Little Long Lake include black bullhead, black crappie, bluegill, brown bullhead, common carp, green sunfish, hybrid sunfish, largemouth bass, northern pike, pumpkinseed, walleye, yellow bullhead, yellow perch. Little Long Lake is located in Hennepin County, Minnesota.
What did the DNR fisheries survey find at Little Long Lake?
- Minnesota DNR's Standard Survey on July 22, 2024 caught 0.33 walleye per gill net at Little Long Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Little Long Lake’s water-quality measurements separately, and the water-quality trend over 6 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
When does Little Long Lake thaw?
- Little Long Lake typically has ice-out around Apr 5.
Are there boat ramps on Little Long Lake?
- Little Long Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Little Long Lake. Public access is listed as yes.
Can I fish at Little Long Lake?
- Little Long Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Minnesota's fish and wildlife agency, so check its current regulations before you go.
Explore Little Long Lake across LakeQuality
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Fish species and best lakes in Hennepin County
Species activity outlook by water temperature and season
Where to stay at Minnesota's top lakes, each with its readings
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Minnesota's cleanest lakes, ranked on agency measurements
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State Parks Near Little Long Lake
Other Lakes in Minnesota
Mesotrophic Lakes in Minnesota
Where this data comes from
368 measurements from 2 monitoring stations, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA368 samples · 2020–2024
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- 4500 N C ~ Persufate Method for Total Nitrogen
Monitoring station identifiers (2)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder
Named boat-access points from the USGS National Boat Ramps inventory
Ice data from Minnesota DNR Climate